Telephone system.



7 S. A-. BEYLANDL TELEPHONE SYSTEM. APPLICATION FILED SEPT.2B. I914.RENEWED FEB. 11, 1919- l,-301,363. E Patented Apr. 22,1919.

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TTED STATES ART SIDNEY A. BEYLAND, OF ROCHESTER, NEW YORK, ASSIGNOBI, BYMESNE ASSIGNMENTS, TO STROMBERG-CARLSON TELEPHONE MFG. (10., OFROCHESTER, NEW YORK, ACOR- POBATION OF NEW YORK.

TELEPHONE SYSTEM.

Specification of Letters Patent.

Patented Apr. 22, 1919.

Application filed September 28, 1914, Serial No. 863,843. RenewedFebruary 17, 1919. Serial No. 277,647.

To all whom it may concern: 7

Be it known that I, SIDNEY A. BEYLAND, a citizen of the UnitedtStates,residing at Rochester, in the county of Monroe and State of New-York,have invented certain new and usefulImprovements in'Telephone Systems;and I do hereby declare the following to be afull, clear, and exactdescription of the invention, such as will enable others skilled in theartto which it appertains to make and use the same.

My invention relates to improvements in telephone systems, andespecially to the type of system which is known "asa house orintercommunicating system from the fact that it is especially adapted tobe used where all of the stations associated therewith are with-' in thecurtilage, but which is adapted to be placed in communication with othersys items through suitable means, such as trunking connect1ons.-

One of the objects of my invention is to place the supervision in thetrunking connection under control of the subscriber in theintercommunicating system.

Another object of my invention isto provide means whereby the localbattery in the intercommunicating system isemployed for all'purposes inconnection with local calls and the regular battery in the mainexembodiment of my invention.

The private branch exchange system is' shown generally at I. The mainstation of the general telephone system is shown atIII and at 11 isshown a telephone line representing one of a number of lines connectingthe main station with the substations; At A I illustrate in detail oneof a number of substations inthe intercommunicating system. At H isindicated the operators set of a special station, known as the attendantstation, which is'provided with means for controlling the truckingconnections to the main exchange at 1114 Venues apparatus as l5. Theapparatusin the right-hand end is located at the main station 111, as isthe cord circuit B and the'apparatus in the lefthand side of the line-11.

The character of the individual pieces of 'mechanism employed in theembodiment illustrated willbeclear from the symbols employed in thediagram to represent theseelements, and the invention will probably bebetter understood, as well as its functions,

from a description of the operation, which 1s as follows:

Assuming, first, that the subscriber at A I desires'to' communicate withthe subscriber at D, the subscriber at A removes the receiver'E from thehookswitch 6 which being spring pressed upward, rises and engages thecontact 7 completing a circuit through the relay 1, as follows: groundat 8 battery C relay l contacts 9 and 10 i of the switch Ircontacts ofthe key 11 the conductor 12 6- 7 transmitter 13- E- conductor 14:- thecontacts 15 and 16 of the key L through the contacts of the keys L and Lto ground at17.' The relay 1 attracts its armature 18, closing theswitch 1819 and a circuit through the lamp G, as follows: ground 20' 18-19- G- 2- conductor '21 battery C to ground 8. Thiswill energize therelay 2 and complete a circuit through the night alarm signal 3, as willbeappa rent. The lamp G will be lighted and will be perceived bytheattendant, who will operate the keys and L, placing her setat H incommunication with the subscriber at A, over the following circuit:beginning at contact 7 of the station 7 13 E- 14,- 16- 22+ conductor23+- eontacts 24cand 25 of the key L conductor 26 contacts 27 and 28 ofthe key M conductor 29- contacts 30 and 31 of the key K- conductor 32-now closed contacts 33 and 34 the substation 45 and 10 of the key L 12 6back to 7. This circuit Will receive'current from the battery C asfollows: ground at 50- Winding 51 of W conductor 52' onv onesideconductor 53- winding 54 of W to ground at 55. Over this circuit theattendant; at H learns that it is the subscriber at B that is wanted;She accordingly operates the key M'Which disconnects her set H from thesubscriber at'A at39-40 and: 27'28: and connects the subscriber at A tothe trunk 4 and 5 at thecontacts 40,- 60and 27, 61L A circuit Willthenbetcompleted through the line relay 62 at the mainstation III asfollows: 63- battery 6,, 62- contacts 64 65 conductor 5- the relay 0and, condenser 66 in multiple the contact 60- IO-- 41- 4 1-12substationset at A 14: 23 26 27 61- conductor4- 67- 6 8- 69- ground 70.The relay 62 will'attract its armature 7-1, closinga switch 71-72,completing a circuit through the lamp N as follows:- 63'- C 72- 71 73 N-ground 74. The lamp N will be energized, and being: observed by theoperator at III, the plug P isinserted into the jack J, the tip-80,-the-sleeve 7 41 and the ring 7 5 engaging, respectively, with the tipspring 6, the ring spring 79, and the sleeve 81 of the jack. A circuitwill be completed" through: the cut-oflfrelayi 82 and: the sleevesupervisory relay 83-, as follows: ground" 84:- 82; 85 81- 75 -83:- 86battery (3 to ground87, energizing therelays 82 and 83; Therelay82'attractsits armatures 65 and 68, cuttingoff the line signal andlamp-from the line, and the relay 83 attractsitsarmature-SZ, closing aswitch 87 88 in the circuit of the supervisory lamp 89,- which wouldbe:energized except that at the same time a circuit is completedthroughtherelay 90, asfollows: 87. C Winding- 91 of relay 90' side, 92of the cord- -74;-- 7;9- 5 through the intercommunica'ting: system overthe samecircuit as described inconnection with the operation of the linerelay: 62, which includes the tall'cin'g bridge' at the'station A backover the side, 4 of the trunk 76' 80- 94 the winding 95 of the relay 90to ground at 96. The relay 911 attracts its armature 97, opening up thecircuit of the lamp 89 and preventing the energization. thereof at thistime. The operator at III now bridges herset across the cord, and'isthereby placed a in communication with the person at A over the samecircuit asdescribed in connection with thesupenvisory relay 90, exceptas'to' the bridge at station III.

Having learned that it is the station at D that is wanted, the line IIIis tested in the Well known! way, by Well known apparatus, and?having.:-been found" idle-as we willlassume, the plug-P is inserted intothe jack J,. This will cause the operation at. the cutoff relay 100 andthe supervisory relay 101 the line II the tal'king strands ofthe cord'-the sides 4 and 5 ofi thetrunk and through the intercommunicating systemover the same circuit as described in connection,

with the operation of the linef'relay 62, current being supplied by thebattery 0,

through the coils of'the supervisory relays.

108 and 90. 1

Duringthese periods the relay 0 will be actuated by current passing overthe trunk,

attracting its armature 109 and opening a switch 109110 and closing 'aswitch; 110-111 through. the winding r of the relay R, which will causethe attraction of the armature 112,'opening theswitchi112 113' andopening the bridge oi the drop:

signal S. The opening: ofxthe switch 109- 110 broke the lockingcircuit'of relay Q. When the conversation isfterminated ,;the subscriberat A replaces thereceiver E upon the hook switch 6, breaking the circuitpreviously described, which includes the contacts 6 and 7 and the relay90. Thejrelay 90' will be deenergized, letting o the armature 97,, whichwill closeacircu1t'97+120 inthe circuit of the lamp 89, which: will:be.v

lighted indicating to the operator at; the

station III that the subscriber at A has finished, whereupon the'plug Pwill be Withdrawn from the aok J and; that end ofthe system restored tonormal, the-opening of the switch 6-7 breaking the circuit of relay 'OIn the same manner, the callinglend of the cord willzbe released and;restored to normal;

Assuming that the subscriber at D desires to communicate with thesubscriberat A, th

receiver 103 is removed from the hook 104,;

which as explained,,will1 engage the contact and a circuit will becompleted through,

the line relay 121, which willcause the ac tuat-ion of' the line lamp122 in the same manneras was previously described in connection withtheline relay 62 and lamp N. Observing the burning of the lamp 122, theoperator at III willinsert the plug P into the jack J causing theenergization of the cut-oil relay 100- and supervisory relay- 83, aspreviously described in connection with the othenline circuit; F or; thesame reasons as stated before, the lamp 89 will not be lighted, owing tothe energization of the relay 90. When the operator at the station IIIlearns that it is the station A that is wanted, she will insert the plugP into the jack J, operating the cut-off relay 82 and the supervisoryrelay 101, as will be apparent from the description ofthe other portionof the system. Ringing current is then applied to the trunk line bybridging a ringing machine across the calling end of the cord in thewell known manner. The ringing current will flow from the tip of thecord over the side 4 of the trunkthe drop S switch 113112 side 5, backto the sleeve side of the cord. The drop S will. be atcuit through therelay Q as follows: Q

1t2 I4:1 110 C' 143. The relay Q, will be energized, closing the switch144145 and a locking circuit for itself as follows: ground at 150- thekey 1-51 switch 109-110 144 145 relay Q 143 battery C to ground at 13 3.The attraction of the armature 160 closes a switch 160161 and completesa holding bridge 162 including the coil 7" of the relay B. This is forthe purpose of holding the trunk during the calling and connection ofthe subscriber at A. The attendant at H then depresses the ringing key11 and operates the bell at the substation A. When the subscriber at Aresponds, that fact will be indicated by the illumination of the lamp Gif the key L has not been depressed, and if the key L has beendepressed, the relay W will be energized over a circuit including theconductors 29 26 23+ 141- substation set at A',' 12 1 ll 38 and thebattery C. The relay W will attract its armature 150 and break thecircuit of the lamp U. The operator then depresses the key M whichplaces the subscriber in communication with the subscriber at D over thesame circuit as previously described when the operation was described inthe other direction. The relay 0 will be energized, as described before,opening the switch 109110 in the locking circuit of the relay Q, therebybreaking the holding bridge 162.

IVhen the conversationfis completed, the subscribers will restore theirreceivers to the hook and the supervisory signal will be given to theoperator at the main station 111, as previously described, The operatorwill withdraw the plugs from the acks, rcstoring the system to normal.

When the subscriber at A desires to com municate-with a subscriber in anintercommunicating system, such as at the substation H, the keys K and Lare depressed, placing these two parties in communication, as previouslydescribed, employing the battery C as a source of talking current.

I have illustrated this particular embodiment of my invention and theform and details of the embodiment and of the apparatus employed thereinfor the purpose of describing and illustrating one form of my invention.I do not wish to be limited to these forms. and details thereof, as Icontemplate numerous and extensive departures from such forms anddetails without departing from the spirit of the invention.

Iclaim:

1. In a telephone system, the combination of an intercommunicatingsystem, an attendant substation therein, a telephone exchange,

a trunk line coimecting the exchange to the intercommunicating system, aholding device for said trunk line, apparatus for connecting theattendants station to the trunk line, electromagnetic mechanismassociated with the trunk line controlling the holding device, a circuitfor said electromagnetic mechanism governedby said apparatus, lockingmechanism for said electromagnetic mecha nism, including contactsgoverned by said electromagnetic mechanism and a trunk relay in saidtrunk having contacts in said locking mechanism controlled by said trunkrelay. 2. In a telephone system, the combination of anintercommunicating system, an attendant substation therein, a telephoneexchange, a trunk line connecting the exchange to the intercommunicatingsystem, a holding bridge for said trunk line, a listening key forconnecting the attendants station to the trunk line, a relay associatedwith said trunk line having contacts in the holding bridge, a circuitfor said relay including contacts controlled by said listening key, alocking circuit for said relay, including contacts of said relay and atrunk relay in said trunk having contacts controlled by said trunk relayin the locking circuit of said first-named relay. 3. In a telephonesystem, the combination of an intercommunicating system, a plural ity ofsubstations in said intercommunicatingsystem, including an attendantsstation, a subscribers set at each of said substations, a regulartelephone exchange and a trunk circuit connecting said exchange and saidintercommunicating system, a trunk relay in said trunk circuit, aholding bridge for said trunk circuit, a relay having contacts in theholding bridge, a circuit tor said relay,

means for connecting the attenclants set to name inthe presence of twoWitnesses this the trunk circuit, controlling said relay eir- 4th. dayof September, 1914.

cuit, and a locking circuit for said relay in- SIDNEY A. BEYLAND.eluding contacts controlled by said trunk Witnesses: 5 relay. I GEO. E.ROBERTS, In Witness whereof, I have signed. my M. J. ARND'L,

Gopiesof this patent, may bev obtained. for five cents each, byaddressingithe,Commissioner of -ratents,

Washington, D. G. v

